David Galloway

If you're looking for a fun electronics project to give a small fright to trick-or-treaters you can create a spooky blinking eyes setup where several sets of colored eyes blink randomly by constructing LED eyeballs, an ATtiny85 microcontroller, and an Arduino.

Instructables user vatosupreme created the effect in the above video by constructing the eyes using ping-pong balls, LEDs, and wooden poles and connecting those LEDs to a control board built with an ATtiny85 microcontroller. He then used his Arduino to interface with the ATtiny85 and provide the code powering the effect. Full details can be found at the source link below.